Scala Map 与 HashMap
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Scala Map vs HashMap
提问by jstnchng
Is there a difference between a Scala Mapand a HashMap? I am using the scala.collection.immutable.HashMap.
ScalaMap和之间有区别HashMap吗？我正在使用scala.collection.immutable.HashMap.
回答by johanandren
scala.collection.immutable.Mapis the interface for immutable maps while scala.collection.immutable.HashMapis a concrete implementation.
scala.collection.immutable.Map是不可变映射的接口，而scala.collection.immutable.HashMap是具体实现。
Creating with Map()or Map.emptygives a special empty singleton map, with Map(a -> b)with up to 4 pairs yields specialized classes for such small maps, and 5 and upwards gives you scala.collection.immutable.HashMap
创建Map()或Map.empty提供一个特殊的空单例映射，Map(a -> b)最多 4 对生成用于此类小映射的专用类，5 及以上为您提供scala.collection.immutable.HashMap
